Need help identifying this

ad93am

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Hi,
Im having trouble identifying this that came on the live rock. I'm having trouble finding anything online similar. Is this a sponge? Harmless? Thoughts?
thanks.
sponge.jpg
 

High pressure shells: Do you look for signs of stress in the invertebrates in your reef tank?

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  • I occasionally look for signs of invertebrate stress in my reef tank.

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  • I rarely look for signs of invertebrate stress in my reef tank.

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  • I never look for signs of invertebrate stress in my reef tank.

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